Abstract
To improve the poor Gondwana paleomagnetic database for Devonian times, detailed paleomagnetic analyses were performed on red chert-like rocks and partly silicified paleosols within the Lower Devonian Ikniouen level (fine-grained sandstones including red ironstone) in conformity within the sub-horizontal Tadrart coarse white formations of the Murzuq basin. Silicification, limited to this level that is only a few meters thick, was probably due to tropical warm climatic conditions during and shortly after the rock deposition. In two sections 40 km away each other, paleomagnetic data point out a high-temperature Characteristic Remanent Magnetization (ChRM) with very well-defined mean direction, positive reversal test and relatively high (5) Q and R scores. Rock magnetic data indicate minerals of the hematite family, but the presence of a minor amount of other mineral phases remains possible. At least part of the ChRMs are Chemical Remanent Magnetizations, likely acquired during or shortly after deposition. The corresponding paleomagnetic results (paleomagnetic pole at 28.6° E and 71.1° S, with K = 1004, A95 = 1.5°) could have major geodynamical implications for the Gondwana supercontinent. In fact, ChRM acquired in this level during or shortly after deposition should imply a much-unexpected fast latitudinal continental drift of the Gondwana during the Lower Devonian or a significant and fast true polar wander. Though much more difficult to match with the ChRM and geological characteristics, the only possible alternative interpretation for the Ikniouen data should be a chemical remagnetization acquired during the Late Cretaceous–Early Paleocene times.
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Acknowledgements
The Algerian–French PICS cooperation program «Architecture lithosphérique et dynamique du manteau sous le Hoggar» supported this project. We are grateful to the civil and military authorities at Djanet and to the "Office du Parc National du Tassili"—OPNT (now "Office National du Parc Culturel du Tassili N'Ajjer"—ONPCTA) for help during the fieldwork. Jean Besse and Neli Jordanova are thanked for very constructive discussions and Christopher Day for strong improvement of the manuscript. We are grateful to Renata Tomezzoli, Andy Biggin, and Eduard Petrovský for constructive comments on a preliminary version of this paper and to two anonymous reviewers for the present version.
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The Algerian–French PICS cooperation program «Architecture lithosphérique et dynamique du manteau sous le Hoggar» supported this project.
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Derder, M.E.M., Henry, B., Maouche, S. et al. Enigmatic well-characterized remanent magnetization of silicified Lower Devonian rocks from the Tadrart area (Murzuq basin, SE Algeria). Int J Earth Sci (Geol Rundsch) 111, 1185–1200 (2022). https://doi.org/10.1007/s00531-022-02173-6
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DOI: https://doi.org/10.1007/s00531-022-02173-6